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• We suggest that analytical laboratories perform an "interference check' analysis of 3- <br /> tnethylpentane and 2-methylpentane standards in the presence and absence of <br /> MTBE. This test will evaluate whether these compounds co-elute with MTBE under <br /> the routine conditions used for performing EPA 802�A (or &02IB} analysis in <br /> individual laboratories. <br /> If you have any questions or comments on this or other marters related to this request, <br /> please call Kim Ward of my staff(916) 227-4319. <br /> Attachments <br /> cc. Anne Happel, LLNL <br /> Rec vcfad?ccer Our musror is.o preserve and erirarce:ire gsaiitp or CaGfarria r water,-esaurces.and <br /> 'L C enure!herr.rOCer ai:oc_aon and gfc:ert!se j or vire aene.hf of present and'.Clare generatians. <br />